| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Build Automation Software | 8.6 (#5) | 8.1 (#13) |
| Notable limit | The manual says Buildroot does not generate binary packages such as .deb or .ipkg files. | Ninja has no built-in rules, such as rules for compiling C code. |
| Purpose | Buildroot automates building complete embedded Linux systems through cross-compilation. | Ninja is a small build system designed to evaluate incremental builds quickly. |
| Support | Community support is available through the OFTC IRC channel, a mailing list, and the GitLab bug tracker. | The project site links to a mailing list and lists the #ninja-build IRC channel on irc.oftc.net. |